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Proceedings Paper

Plastic disk inspection system: an approach using two-dimensional birefringence distribution measurement
Author(s): Yukitoshi Otani; Kenichi Ishizuka; Toshiyuki Kanno; Toru Yoshizawa
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Paper Abstract

A plastic disk for the next generation of a hard disk requires high quality surface. Especially its flatness is very important. A plastic disk inspection system is proposed by using a 2D birefringence distribution. Small birefringence is a serious problem that is caused by internal strain or residual stress in disks. It is necessary for the birefringence measurement to determine the relative retardation and the azimuthal angle of the fast axis in plastic disks. A 2D birefringence distribution is measured in this system. Several images captured by a CCD camera are sufficient for one birefringence distribution analysis. These experimental procedures and the results of plastic disks for hard disks are discussed.

Paper Details

Date Published: 23 October 2001
PDF: 4 pages
Proc. SPIE 4398, Optical Measurement Systems for Industrial Inspection II: Application in Industrial Design, (23 October 2001); doi: 10.1117/12.445545
Show Author Affiliations
Yukitoshi Otani, Tokyo Univ. of Agriculture and Technology (Japan)
Kenichi Ishizuka, Tokyo Univ. of Agriculture and Technology (Japan)
Toshiyuki Kanno, Fuji Electric Co., Ltd. (Japan)
Toru Yoshizawa, Tokyo Univ. of Agriculture and Technology (Japan)


Published in SPIE Proceedings Vol. 4398:
Optical Measurement Systems for Industrial Inspection II: Application in Industrial Design

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